Reserve dyeing on vegetable fibers



Patented Aug. 7, 1928.

UNITED STATES PATENT- OFFICE.

HANS LEEMANN, OF BOTTMINGERMUHLE-IBINNINGEN, NEAR BASEL, AND GIOVANNITAGLIANI, OF, BASEL, SWITZERLAND, ASSIGNORS, BY MESNE ASSIGNMENTS, TO-MUNITEX CORPORATION, OF LODI, NEW JERSEY, A CORPORATION OF NEW JERSEY.

RESERVE DYEING ON VEGETABLE FIBERS.

No Drawing. Original application filed April 27, 1925, Serial Noi26,289, and in Germany May 7, 1924.

- Divided and this application filed May 20, 1926. Serial No. 110,541.

This application is divisional of application Ser. No. 26,289.

The hitherto known reserve processes consist of mechanical or chemicaloperations.

To the first type belongs the binding and the covering of'the vegetablefibers (yarns and fabrics.) that the estufis employed can only soak inand be fixed on the unbound or uncovered parts of the fabric. To thesecond class belongs the application of certain agents, preferably ofsalts, which react chemically during the dyeing or during thedevelopment of the dyes. All these processes depend, however, on certainconditions. If the reserve agents employed are removed during the dyeingprocessor during the developement of the dyes, or it they do not resistthese operations until the end of the dyeing, then the desired reserveeffect does not occur and the fabric is dyed uniformly throughout as ifthe reserving agents had not been used at all.

It is known from German specification No. 346,883 and others, that itis, possible to render vegetable fibers (yarns, loose mate rial,fabrics) completely immune against substantive dyestuffs by treatingthem after tive dyestufis.

alkalinization with solutions of aromatic carboxylic acid chlorides oraroma-ticsulplroacid chlorides. Both the alkalinization and the actionof the aromatic acid or sulphoacid chlorides are so efi'ected that thewhole of the vegetable fibers is brought into.

the solutions of the respective agents. I

It has now been shown in a surprising manner that this esterificationcan also be used for the topical alteration of the vegetable fibers, inview of the production of reserve effects, for example in a suitableprinting process. It was not at all to be foreseen from the more activetreatment in solution that the short superficial and sparing localtreatment, as it takes place .for example in the printing process, wouldsufiice to produce the desired esterification. This process affordspermanently reserving patterns with unexpected dyeing properties, which.remain fast even after hot washing operations, after hot neutral, acidor alkaline dye baths.

The production of such reserve efliects is now utilized in the processfor reserve dyeby substances insoluble-in water so of the presentinvention. This process consists in first treating topically thevegetable fibers bya local printing with a suitable alkalizing agent,such for example as a con centrated alkaline solution, with or withoutup the dye, so that they appear white on a colored ground.

By subsequently covering the esterified fibers and dyeing with a basicdyestufl', peculiar batik effects can be obtained, especially if thenormal unaltered fibers or the fabrics are subsequently dyed withsubstan- The fibers. may be in form of loose material, yarns or fabrics.As dyestuffs, there may be used the usual coloring matters which aresuitable for carrying out the improved process.

What we claim is:

1. A process for reserve dyeing on vegetable fibers, which consists intreating toplcally the vegetable fibers by a local printing with analkalizing agent, thereupon applying an esterifying aromatic acidchlorlde to produce a topical alteration of the locall printed fiber,thus constituting reserve e fects, then washing after theesterification, thereupon treating the thus toplcally altered fibers,with covering substances and afterwards dyeing same first-with a basicand then with a substantive dyestufl, in order to obtain batik efiects.

2. A process for reserve dyeing on vege-- ing on vegetable fibersforming the subject chloride, in pure .or

ride to produce a topical alteration of the locally printed fiber, thusconstituting reserve eifects, then washing after the esterification,thereupon treating the thus topically altered fibers with coveringsubstances and afterwards dyeing same first with a basic and then with asubstantive dyestuif, in order to obtain batik effects.

3. A method of reserve dyeing on vegetable fibers which comprisestreating predetermined areas of said fibers with an alkalizing agent,esterifying said treated areas with an aromatic acid chloride wherebyreserve effects are produced, washing said fibers, covering saidpre-deternlined areas and dyeing same first with a basic and then tainbatik effects.

In witness whereof we have hereunto signed our names this 10th day ofMay, 1996.

HANS LEEMAN N. GIOVANNI TAGLIANI.

